i get 12 on a good day on my 1/2 ton, 53 gmc, 228, 1 bbl, 4:10 4speed and am happy as can be. the rebuilt zenith did the trick!


Overland Blue, 1953 GMC 1/2T, 100-22, 228/1bbl, 4sp/4.10 6v, shortbed/fender side/5-window.